The deepest point in all the world’s oceans is the Mariana Trench. It is also the lowest elevation of the surface of the Earth’s crust. The Mariana Trench is in the Pacific Ocean. The trench is 1,580 miles long, and it is 43 miles deep! If Mount Everest, the tallest mountain in the world, was placed inside Mariana Trench, there would still be 6,811 feet of water left above it!